Verify Accelerometer Power and Constant Current Supply

December 21, 2018

Configure VibrationVIEW

Figure 1. Configuring accelerometer power.

  • Open VibrationVIEW and connect to a VR9500.
  • Turn on Accelerometer Power for Ch 1 to 4.

Check ICP Voltage

  • Connect three (3) 50Ohm terminators to Channels 2, 3, and 4.

  • Read the voltage on a DMM (Agilent 34410A or Agilent 34401A)
    • Insert the BNC connector into the two holes on the top right of the DMM’s front panel. The BNC cable should be to the right.
    • Press the shift key on the lower right and then press the top left button marked V DC.

Figure 3. Connecting the VR9500 to the DMM.

  • Connect Ch 1 to the DMM and measure milliamps (I) DC.
  • Measure and record Amperage between pin (+) and shell (-) (3.55mA + or – 1.66mA = 2.49 – 4.61mA tolerance).
  • Measure Accelerometer Power current for each channel. Any channel not being measured should have a 50Ohm terminator to prevent any leakage across channels. Record data in the table below.
Ch1 Vdc =                 V              Tolerance = 24V ± 2.4V  (21.6V – 26.4V)
Ch1 Idc =                mA             Tolerance = 3.55mA ± 1.06mA (2.49mA – 4.61mA)
Ch2 Vdc =                 V              Tolerance = 24V ± 2.4V  (21.6V – 26.4V)
Ch2 Idc =                mA             Tolerance = 3.55mA ± 1.06mA (2.49mA – 4.61mA)
Ch3 Vdc =                 V              Tolerance = 24V ± 2.4V  (21.6V – 26.4V)
Ch3 Idc =                mA             Tolerance = 3.55mA ± 1.06mA (2.49mA – 4.61mA)
Ch4 Vdc =                 V              Tolerance = 24V ± 2.4V  (21.6V – 26.4V)
Ch4 Idc =                mA             Tolerance = 3.55mA ± 1.06mA (2.49mA – 4.61mA)